Graphite packing-a sealing function chu three-stage dynamic process hmangin a thleng thei a: contact-Deformation-Maintenance:
1. Seal din hmasak ber .
Seal cavity-a packing dah a nih a, axial preload a hman chuan (eg, via gland bolts) packing rings chu compress leh expand radial-a siam a ni a, rotating shaft emaw reciprocating rod surface emaw nen close contact a siam a ni. Hetiang dinhmunah hian a pawimawh ber chu preload force hmanga medium pressure leh axial vibration-in nghawng a neihte hneh a, initial contact pressure a hlawhtlin theih nan a ni.
2. Dynamic condition hnuaia seal enkawl dan .
Equipment hnathawh lai hian rotating shaft emaw reciprocating rod emaw kal chuan sealing surface inkarah relative displacement a thlen thin (eg, shaft-a rotating friction emaw piston-a reciprocating sliding emaw atanga lo chhuak). Graphite packing-a self{-lubricating property hian frictional resistance nasa takin a tihziaawm a, adhesive wear emaw heat buildup avanga seal failure awm theihna a tlem phah hle. Chubakah, packing-a flexibility hian shaft deflection emaw vibration emaw te pawh a siam thei a, local deformation hmangin contact interface kal zel chu a vawng reng bawk.
3. Compensation leh long-Term stability ha rawh .
Over extended operation, friction hian sealing surface te chu a ha ngei ngei tur a ni a, chu chuan initial contact pressure a tihhniam phah a ni. Hetih lai hian packing-a residual compressive elasticity leh medium pressure te chuan an thawk dun a, packing chu a chhe tawhna lam hawiin an nawr a, "self-compensating" effect a siam a ni. Chubakah, operating condition thenkhatah chuan pawn lam lubrication system (tui, oil, emaw inert gas injection ang chi) chuan frictional heat a tihtlem belh thei a, service life pawh a ti rei thei bawk.
